Effect of specific adsorption on electrochemical phenomena in lithium ion secondary battery
Date Issued
2005
Date
2005
Author(s)
Kao, Ta-Wei
DOI
zh-TW
Abstract
The application of artificial graphite as anode material for lithium ion secondary battery has been researched for several years. The reversible capacity of DPG over 400mAh/g, even higher than the theoretical value 372mAh/g, is contributed by the inner structures such as CNT and C60. Unfortunately, the difficulty of cutting down irreversibility is still the main problem looking forward to conquer to reach the market standard.
The conception of experiments is resolving the irreversible phenomena in the DPG lithium secondary battery. Surface oxidative treatment, hydrochloric acid and hydrofluoric acid rinsing are three different methods carried out in this research. The electrochemical behavior of lithium secondary battery was confirmed by cyclic voltammetry. AC impedance was also used in this research to observe the charge transfer between the electrochemical interfaces and the possible irreversibility mechanisms.
Results from the charge-discharge experiments indicate that the irreversibility is tended to ease with increasing hydrofluoric concentration. The irreversibility is lowered down to 24.59% for 9N hydrofluoric rinsed treatment, which is the best result since ever.
According to the corrosion current density analyzed from the results of cyclic voltammetry, there is a distinction between two different systems and suggested by the specific adsorption between fluorine ion and chloride ion. This might be one of the reasons why hydrofluoric system shows a better irreversibility in lithium ion secondary battery.
Subjects
鋰離子二次電池
DPG人工石墨
奈米碳管
特異吸著
lithium ion secondary battery
DPG artificial graphite
CNT
specific adsorption
Type
thesis
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